//
//  Copyright (c) 2014 VK.com
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy of
//  this software and associated documentation files (the "Software"), to deal in
//  the Software without restriction, including without limitation the rights to
//  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
//  the Software, and to permit persons to whom the Software is furnished to do so,
//  subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
//  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
//  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
//  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
//  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

package com.vk.sdk.api.model;

import com.vk.sdk.VKSdk;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

/**
 * Base class for VK API arrays
 */
public abstract class VKApiArray<T extends VKApiModel> extends VKApiModel {
    private List<T> items;
    private int count;

    @Override
    public VKApiModel parse(JSONObject object) {
        try {
            JSONArray jsonArray;
            if ((jsonArray = object.optJSONArray("response")) == null)
            {
                object    = object.getJSONObject("response");
                count     = object.getInt("count");
                jsonArray = object.getJSONArray("items");
            }
            parse(jsonArray);

        } catch (JSONException e) {
            if (VKSdk.DEBUG)
                e.printStackTrace();
        }
        fields = object;
        return this;
    }
    public void parse(JSONArray jsonArray) {
        items = new ArrayList<T>(jsonArray.length());
        for (int i = 0; i < jsonArray.length(); i++) {
            try {
                items.add(parseNextObject(jsonArray.getJSONObject(i)));
            } catch (JSONException e) {
                if (VKSdk.DEBUG)
                    e.printStackTrace();
            }
        }
        if (count == 0)
            count = items.size();
    }

    protected T parseNextObject(JSONObject object) {
        try {
            T model = createObject();
            model.parse(object);
            return model;
        } catch (Exception ignored)
        {
            return null;
        }
    }
    protected abstract T createObject();

    public T get(int index) {
        if (items == null) return null;
        return items.get(index);
    }

    public int size() { return count; }
}
